1. Department of Soil Science, Faculty of Agriculture, University of Zanjan, Zanjan 45371-38791, Iran
2. School of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada
3. Department of Remote Sensing & GIS, Faculty of Geography, University of Tehran, Tehran 14155-6465, Iran
4. Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil 56199-11367, Iran